Method for Flattening Proton Exchange Membrane for Fuel Cell and Apparatus Therefor

Abstract

A method for flattening the proton exchange membrane for the fuel cell and an apparatus therefor are used in flattening the proton exchange membrane which is soaked with phosphoric acid. The control precision of this method can be higher than the traditional adsorption method. The mechanical transfer of proton exchange membrane can be realized so that the processing efficiency of proton exchange membrane in the process of fuel cell membrane electrode assembly is greatly improved.

Claims

1. A process to flatten the proton exchange membrane for the fuel cell, characterized by: said apparatus comprises a first plate (1) and the second plate (5), and the first plate (1) is placed over the second plate (5) and the lower surface of the first plate (1) is covered with the first protective film (2). The first sliding block (3), which has a flat the lower surface, is disposed between the first plate (1) and the first protective film (2). The first sliding block (3) can slide back and forth along the lower surface of the first plate (1). The second protective film (4) is disposed on the upper surface of the second plate (5). Likewise, the second sliding block (6), whose the upper surface is flat, is disposed between the second plate (5) and the second protective film (4). The second sliding block (6) can slide back and forth along the upper surface of the second plate (5). The first protective film (2) and the second protective film (4) are opposed to each other, and the first sliding block (3) and the second sliding block (6) are opposed to each other, The flattening method of proton exchange membrane comprises: 1) The proton exchange membrane to be flattened (7) is soaked with liquid on the upper and lower surfaces, and is placed on the second protective film (4) so that the proton exchange membrane (7) is located above the second sliding block (6). 2) Move the first plate (1) downward so that the first protective film (2) is in contact with the proton exchange membrane to be flattened (7), and the proton exchange membrane (7) which is to be flattened is located beneath the first sliding block (3). Apply a pressure between the first sliding block (3) and the second sliding block (6). 3) Slide the second sliding block (6) to the left or right to separate it from the proton exchange membrane (7). The proton exchange membrane (7) is transferred to the lower surface of the first protective film (2), and underneath the first sliding block (3). 4) Move the first plate (1) to the placement area of proton exchange membrane (7) after flattening that has a flat surface. Apply a pressure between the first sliding block (3) and the upper surface of the placement area. 5) Slide the first sliding block (3) to the left or right so that the first sliding block (3) is separated from the top of the proton exchange membrane (7). After flattening, the proton exchange membrane is transferred to the upper surface of the placement area.

2. The flattening method according to claim 1, characterized by: the liquid soaking the proton exchange membrane is a phosphoric acid solution with a mass concentration of 70-95%.

3. The flattening method according to claim 1, characterized by: the pressures described in steps 2) and 4) are 50-500N.

4. The flattening method according to claim 1, characterized by: in step 3), when the proton exchange membrane (7) is located below the first sliding block, the first plate 1, together with the first sliding block (3), the first protective film (2), and the flatten proton exchange membrane (7) are moved by a mechanical part to a placement area where pictures can be taken, identifying the position the proton exchange membrane (7) relative to the first protective film (2) by CCD, and, in step 4), the placement area is where the membrane electrode assembly is being assembled, and the position of the said flattened proton exchange membrane 7 on the assembly position of the membrane electrode directly faces the membrane electrode assembly to be assembled.

5. The flattening method according to claim 4, characterized by: aligning the flattened proton exchange membrane (7) on the assembly position of the membrane electrode assembly by controlling the mechanical part to place the proton exchange membrane (7) directly above the electrode to be assembled according to the position recognized by the CCD

6. A apparatus used in the said flattening method according to claim 1, characterized by: said apparatus comprises the first plate (1) and the second plate (5), and the first plate (1) is placed over the second plate (5) and the lower surface of the first plate (1) is covered with the first protective film (2). The first sliding block (3), which has a flat the lower surface, is disposed between the first plate (1) and the first protective film (2). The first sliding block (3) can slide back and forth along the lower surface of the first plate (1). The second protective film (4) is disposed on the upper surface of the second plate (5). Likewise, the second sliding block (6), whose the upper surface is flat, is disposed between the second plate (5) and the second protective film (4). The second sliding block (6) can slide back and forth along the upper surface of the second plate (5). The first protective film (2) and the second protective film (4) are opposed to each other, and the first sliding block (3) and the second sliding block (6) are opposed to each other. The upper surface of the first plate (1) is the placement area where the flattened proton exchange membrane (7) is placed, the first plate (1) is connected to the driving force output end of first driving device. The first plate (1) is driven up and down or left and right by the first driving device. The first sliding block (3) and the second sliding block (6) are respectively connected to driving force output end of the second driving device, and are driven to move left and right by the second driving device.

7. The apparatus according to claim 6, characterized by: the first driving device is a motor whose output shaft is connected with the first plate(1).

8. The apparatus according to claim 6, characterized by: the second driving device is a motor or a cylinder, and the motor output shaft or the cylinder output rod is connected to the first sliding block(3) and the second sliding block(6).

9. The apparatus according to claim 6, characterized by: the apparatus further comprises a CCD identification system that can photograph and identify the proton exchange membrane 7 located below the first sliding block 3 and its relative position on the lower surface of the first plate 1, and generate a control signal which can make the first driving device move the first plate 1 to the specified placement area, and by controlling the moving position of the first plate, the electrode and the proton exchange membrane are to be assembled at the specified location.

Description

DESCRIPTION OF DRAWINGS

[0022] FIG. 1 shows the assembly diagram of the disclosure;

[0023] 1: first plate, 2: first protective film, 3. first sliding block, 4. second protective film, 5. second plate, 6. second sliding block, 7. proton exchange membrane.

DETAILED DESCRIPTION

[0024] The apparatus used in the flattening method includes the first plate 1 and the second plate 5, and the first plate 1 is placed over the second plate 5 and the lower surface of the first plate 1 is covered with the first protective film 2. The first sliding block 3, which has a flat the lower surface, is disposed between the first plate 1 and the first protective film 2. The first sliding block 3 can slide back and forth along the lower surface of the first plate 1. The second protective film 4 is disposed on the upper surface of the second plate 5. Likewise, the second sliding block 6, whose the upper surface is flat, is disposed between the second plate 5 and the second protective film 4. The second sliding block 6 can slide back and forth along the upper surface of the second plate 5. The first protective film 2 and the second protective film 4 are opposed to each other, and the first sliding block 3 and the second sliding block 6 are opposed to each other. The upper surface of the first plate 1 is the placement area where the flattened proton exchange membrane 7 is placed.

[0025] The first plate 1 is connected to the driving force output end of first driving device. The first plate 1 is driven up and down or left and right by the first driving device. The first sliding block 3 and the second sliding block 6 are respectively connected to driving force output end of the second driving device, and are driven to move left and right by the second driving device.

[0026] The first driving device is a motor whose output shaft is connected with the first plate 1.

[0027] The second driving device is a motor or a cylinder, and the motor output shaft or the cylinder output rod is connected to the first sliding block 3 and the second sliding block 6.

[0028] The apparatus also includes a CCD identification system that can photograph and identify the proton exchange membrane 7 located below the first sliding block 3 and its relative position on the lower surface of the first plate 1, and generate a control signal which can make the first driving device move the first plate 1 to the specified placement area. By controlling the moving position of the first plate, the electrode and the proton exchange membrane are to be assembled at the specified location.

[0029] The flattening method of proton exchange membrane is as follows: [0030] 1) The proton exchange membrane to be flattened 7 is soaked with liquid on the upper and lower surfaces, and is placed on the second protective film 4 so that the proton exchange membrane 7 is located above the second sliding block 6. [0031] 2) Move the first plate 1 downward so that the first protective film 2 is in contact with the proton exchange membrane to be flattened 7, and the proton exchange membrane 7 which is to be flattened is located beneath the first sliding block 3. Apply a pressure between the first sliding block 3 and the second sliding block 6. [0032] 3) Slide the second sliding block 6 to the left or right to separate it from the proton exchange membrane 7. The proton exchange membrane 7 is transferred to the lower surface of the first protective film 2, and underneath the first sliding block 3. [0033] 4) Move the first plate 1 to the placement area of proton exchange membrane 7 after flattening that has a flat surface. Apply a pressure between the first sliding block 3 and the upper surface of the placement area. [0034] 5) Slide the first sliding block 3 to the left or right so that the first sliding block 3 is separated from the top of the proton exchange membrane 7. After flattening, the proton exchange membrane is transferred to the upper surface of the placement area.

[0035] The liquid soaking proton exchange membrane is a phosphoric acid solution with a mass concentration of 70-95%.

[0036] The pressures described in steps 2) and 4) are 50-500N.

[0037] In step 3), when the proton exchange membrane 7 is located below the first sliding block, the first plate 1, together with the first sliding block 3, the first protective film 2, and the flatten proton exchange membrane 7 are moved by a mechanical part to a placement area where pictures can be taken, identifying the position the proton exchange membrane 7 relative to the first protective film 2 by CCD.

[0038] The placement area in step 4) is where the membrane electrode assembly is being assembled. And the position of the said flattened proton exchange membrane 7 on the assembly position of the membrane electrode directly faces the membrane electrode assembly to be assembled.

[0039] The method to align the flattened proton exchange membrane 7 on the assembly position of the membrane electrode assembly is as follows: by controlling the mechanical part to place the proton exchange membrane 7 directly above the electrode to be assembled according to the position recognized by the CCD.

[0040] As such, the flattening and rapid movement of the electrolyte membrane can be realized. Compared with the traditional manual flattening method, the system of the current disclosure can shorten service time from 1-2 min to 10-30 s, and compared with the traditional manual membrane electrode flattening, the precision of the membrane electrode assembly can be improved from ±0.5 mm to ±0.02 mm, which greatly improves the processing efficiency of proton exchange membrane and provides a method for automatic and intelligent preparation of membrane electrode assembly.